Even if you took them to court you'd spend more money your self. We are not talking BIG bucks here. The court would find they might owe you a few hundred dollars in damages. Probably wouldn't want to bother with you. Maybe if the culprit was doing allot of this and to many merchants. Especially if he or she was profiting. You might have a case then. You need some solid proof too, the person would probably deny everything and this stuff is hard to prove.